import java.util.*;
public class Example3_9{
  public static void main(String args[]){
    Scanner reader = new Scanner(System.in);
    double sum = 0;
    int m = 0;
    while(reader.hasNextDouble()){
	double x = reader.nextDouble();
	m = m+1;
	sum = sum+x;
    }
    System.out.printf("%d个数的和为%f\n",m,sum);
    System.out.printf("%d个数的平均值是%f\n",m,sum/m);
  }
}
